<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      *,
      *::before,
      *::after {
        margin: 0;
        padding: 0;
        background-color: #333;
        color: #fff !important;
      }
    </style>
  </head>
  <body>
    <h1 title="这是h1元素">Hello</h1>
    <img
      src="https://foruda.gitee.com/avatar/1707369763323285269/10902148_shenhuxiaoniao_1707369763.png!avatar200"
      alt="这是img元素"
    />
  </body>
</html>
